#include "secret.h"
#include <vector>
using namespace std;
template<class T> struct offlineDQ {
static const int SZ = (1 << 10);
int n;
T stor[SZ][32-__builtin_clz(SZ)];
vector<T> a;
void fill(int l, int r, int ind) {
if (ind < 0) return;
int m = (l+r)/2;
for(int i = m - 1; i >= l; i--) stor[i][ind] = Secret(i, m - 1);
for(int i = m; i < r; i++) stor[i][ind] = Secret(m, i);
fill(l,m,ind-1); fill(m,r,ind-1);
}
void init() {
n = 1; while ((1<<n) < (int)a.size()) ++n;
a.resize(1<<n);
fill(0,(1<<n),n-1);
}
T query(int l, int r) {
if (l == r) return a[l];
int t = 31-__builtin_clz(r^l);
return comb(stor[l][t],stor[r][t]);
}
};
offlineDQ<int> odq;
void Init(int N, int A[]) {
odq.a.resize(N);
for(int i = 0; i < N; i++) odq.a[i] = A[i];
odq.init();
}
int Query(int L, int R) {
return odq.query(--L, --R);
}
Compilation message
secret.cpp: In instantiation of 'T offlineDQ<T>::query(int, int) [with T = int]':
secret.cpp:38:28: required from here
secret.cpp:25:14: error: 'comb' was not declared in this scope
25 | return comb(stor[l][t],stor[r][t]);
| ~~~~^~~~~~~~~~~~~~~~~~~~~~~
